Table 1 Characteristics of participants according to quartiles of maternal TTR concentration in pregnancy
From: Associations of maternal serum transthyretin concentration with pregnancy and birth outcomes
Total (n = 6584) | ≤ 210 (n = 1693) | 210 < X ≤ 234 (n = 1667) | 234 < X ≤ 257 (n = 1620) | > 257 (n = 1604) | P-value | |
|---|---|---|---|---|---|---|
Maternal age (years) | 30.0 (27.0–33.0) | 30.0 (27.0–33.0) | 30.0 (27.0–33.0) | 30.0 (27.0–33.0) | 30.0 (27.0–33.0) | 0.051 |
Gestational age (weeks) | 38.9 (38.3–39.3) | 38.7 (38.1–39.3) | 38.9 (38.4–39.4) | 38.9 (38.3–39.3) | 38.9 (38.3–39.3) | < 0.001 |
Parity (1 or more versus 0) | 3547 (53.8) | 979 (57.8) | 892 (53.5) | 838 (51.7) | 838 (52.2) | 0.001 |
Pre-pregnancy BMI (kg/m2) | 20.7 (19.1–22.9) | 20.6 (18.8–22.9) | 20.6 (19.1–22.7) | 20.8 (19.1–23.1) | 20.9 (19.2–23.1) | 0.001 |
Marital status (yes versus no) | 6360 (96.6) | 1634 (96.5) | 1613 (96.8) | 1569 (96.9) | 1544 (94.1) | 0.790 |
Maternal education level | 0.060 | |||||
Primary or less | 81 (1.2) | 21 (1.2) | 22 (1.3) | 23 (1.4) | 15 (0.9) | |
Secondary | 3904 (59.3) | 967 (57.1) | 967 (58.0) | 970 (59.9) | 1000 (62.3) | |
University degree | 2599 (39.5) | 705 (41.6) | 678 (40.7) | 627 (38.7) | 589 (36.7) | |
Child sex (male) | 3484 (52.9) | 925 (54.6) | 885 (53.1) | 831 (51.3) | 843 (52.6) | 0.281 |
Chronic hypertension (yes versus no) | 61 (0.9) | 14 (0.8) | 13 (0.8) | 20 (1.2) | 14 (0.9) | 0.513 |
Pregestational diabetes (yes versus no) | 89 (1.3) | 37 (2.2) | 18 (1.1) | 22 (1.4) | 12 (0.8) | 0.003 |
Hepatitis virus carrying status (yes versus no) | 324 (4.9) | 122 (7.2) | 97 (5.8) | 59 (3.6) | 46 (2.9) | < 0.001 |